/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.hop.pipeline.transforms.multimerge;

import java.util.Comparator;
import java.util.List;
import java.util.PriorityQueue;
import org.apache.hop.core.IRowSet;
import org.apache.hop.core.exception.HopException;
import org.apache.hop.core.row.IRowMeta;
import org.apache.hop.pipeline.transform.BaseTransformData;
import org.apache.hop.pipeline.transform.ITransformData;

public class MultiMergeJoinData extends BaseTransformData implements ITransformData {
  public static class QueueEntry {
    public Object[] row;
    public int index;
  }

  public static class QueueComparator implements Comparator<QueueEntry> {
    MultiMergeJoinData data;

    QueueComparator(MultiMergeJoinData data) {
      this.data = data;
    }

    @Override
    public int compare(QueueEntry a, QueueEntry b) {
      try {
        int cmp =
            data.metas[a.index].compare(
                a.row, data.metas[b.index], b.row, data.keyNrs[a.index], data.keyNrs[b.index]);
        return cmp > 0 ? 1 : cmp < 0 ? -1 : 0;
      } catch (HopException e) {
        throw new RuntimeException(e.getMessage());
      }
    }
  }

  public Object[][] rows;
  public IRowMeta[] metas;
  public IRowMeta outputRowMeta; // just for speed: oneMeta+twoMeta
  public Object[][] dummy;
  public List<List<Object[]>> results;
  public PriorityQueue<QueueEntry> queue;
  public boolean optional;
  public int[][] keyNrs;
  public int[] drainIndices;

  public IRowSet[] rowSets;
  public QueueEntry[] queueEntries;
  public int[] rowLengths;

  /** Default initializer */
  public MultiMergeJoinData() {
    super();
    rows = null;
    metas = null;
    dummy = null;
    optional = false;
    keyNrs = null;
  }
}
